Process of making torch tips



Pasta s ga 17,1940

uNlTEDfsTATEs PROCESS OF MAKING TORCH TIPS PATENT OFFICE Elmer H. Smith,Minneapolis, Minn., assignor to Smith Welding Equipment Corporation,Minnee apolis, Minm, a corporation oi Minnesota Application July 3,1939, Serial No. 282,751 I g 401311118. This invention relates to newand} useful im-' provernents in the manuiactureoitorch tips of thegeneral character disclosed inmyflco-pending application, SerialNurnber:282}'l50,i lled July 3,

The torch tip herein disclosed diflers irom the f above mentioned tip,in that'itf'is constructed from a single piece'oi nietalwhich, afterbeing subjected to a series of swaging operations, while the blank issupported on suitable mandrels and wire elements, is finally reduced toa given size,

after which the wire elements and mandrel are 'Figure 12,! after thenext-swaging operation, go

removed from the blank, whereby a plurality of longitudinally extendingpassages are provided in j 1 the torch tip body,

I drawing and will'be pointed claims. 7

de a simple process of Iormingatorch tip from a single piece of ductilemetal. 1 Q l Other objects of the invention will 'appear from thefollowing description 'and accompanying out in the annexed In theaccompanying drawing there, has been disclosed astructure designedto.carry out the various objects of the invention, but it is to .be

understood that-the invention is not confined to the exact features.shown as various changes'rnay be made within the scope or the' claimswhich follows? I vInthe drawing: I g l Figure l is a view showing thetubularblank supported on a mandrel with wire elements interposedbetween the wall oithe 'bore of the I blank and the, periphery of themandrel;

Figure 2- is a cross-sectional view on 2-2 of-Flgure1;-

Figure 3 is alongitudinal sectional view showing the blank after thefir'stswagingoperation; Figure 4 is across-Sectional view on the line4-4 of Figure 3, showingthe wirejelementspartially embedded inthe'walloi the-bore oi the blank; s l I K Figure 5 is a viewsimilar to Figure 3,showing the blank positioned on a mandrel of smaller diameter than theone shown in Figure 3, with smaller wire elements positioned in thegrooves formed by the wire elements in the first swaging operation; 1

the line iorementioned An object of the invention thereioi is topromovedtherefrom; and

Figure 6 is a cross-sectional view on the line 6-8 of Figure 5;

Figure 7 is a view showing the blank after the second swaging operation;I Figure 8 is a cross-sectional view on the line 5 8-8 of Figure 7;

Figure 9 is a cross-sectional view showing the partially swaged blankpositioned on a still smaller-mandrel; V

Figure 10 is a view showing the blank posi- 1o tioned on the mandrel ofFigure 9, after the swaging operation;

Figure 11 is a cross-sectional view on the line ll-ll of Figure 10,showing the wire elements substantially embedded in the wall of the bore16 v of the blank;

Figure 12 is a view showing a small wire sub-- stituted for the mandrelshown in Figure 10; Figure 13 is a longitudinal sectional view or.

bedded in the metal oi the blank;

Figure 14 is a view showing the blank of Fig-' ure l3, alter the wireelements have been re- Figure 15 is an end view or Figurelix I v Thenovel and simple process herein disclosed, is carried out in thefollowing manner: The

blank, generally designated by the numeral 2, and

' from which the body of the torch tip is to be so formed, is shownprovided with a bore 3 adapted to receive a mandrel 4, preferablyoi'hardened steel. The diameter of the mandrel 4 is relative-J 1ysmaller than the bore Lot the blank, wherebyan annular gap 5 is providedbetween the wall 01'. 35 the bore 3 and'the periphery of the mandrel 4.To form the longitudinally extending passages through the torchtip"body, 'a plurality or wire,

elements 6 are interposed in the gap 5, as'shown' v in Figures 2 and 3.These wire elements are'preim erably spaced equi-distant apart, and maybe supported accurately by suitable supporting c01 j I lars I and 8,placed at opposite ends of the blank 7 2m axial alinement therewith.

After the wire elements have thus been posiiuf tioned between the blank2 and the mandrel4, as shown in Figures 1 and'2, the blank is subjectedto a swaging operation, wherebyits' diameter is reduced and its overalllength elongated.

' Such reduction in diameter of the blank by the swaging dies, causesthe bore 3 to reduce in diameter, whereby the wire elements 8 become embedded in the wall thereof, as shown in Figure 4, it being understoodthat the mandrel 4 is preterably oi hardened steel,.whereby the wireelements so v e wire elements embedded. in, the wall 01- the bore"thereof, as shown in this figure-the blank is removed from the mandrel.and placed on a relatively smaller mandrel 8, and relatively smallerwire elements ll substituted for the wires I. I I v v comprises apluralityof longitudinally extending whereby the wire elements ll willbe spaced outwardly from the periphery of the mandrel-mas shownin-IFigure 6. v

In the drawing, I have shown the wire elements progressively reduced insize foreach swaging operation, whereby the partially completedypassagesor grooves," providedin the wallfoi the bore of the blank, graduallydiminish in-size, as

the process of forming the tipp'roceeds, as will readily be understood.

In the next step. the blank issubjected to another swaging operationuntil the blank is.

reduced to the diameter showninFigm-es 7 and 8, wherein it will be notedthat the bore of the blank is so reduced in diameter that the wireelements .il arebrought into peripheralcontact with the smaller mandrela therebycausing the wire elements to become further embedded in themetal of the blank, ures 7 and 8.

In Figure 9, it win be noted that a still smaller 1 mandrel It! has beensubstituted for the mandrel 9, shown in Figures 7. and 8, and smallerwire elements l3 have also been substituted for the wire elements ll ofFigures 7 and8. The blank is then subjected to another swagingoperationk; whereby its bore is reduced'to substantially the I diameterof the mandrel l2, as shown in Figure 11, after which the mandrel l2 andwire elements i3 are removedfrom the blank. I

In the final operation, a comparativelysmall mandrel or wire H issubstituted for the mandrel i2, and the blank isjthen again swagedpuntilits bore is reduced to thediameter of the wire element or mandrel i4.'The'wireelements i3-and mandrel or wire element H are then removed asclearly illustrated in Figstantially completely embedded It is to beunderstood, however, that theprocess may be carried out byusing the samesize wires for each swagl g operation. The number oimandrels andswaging'operatlons may also be varied without departing from scopeof,the

invention. 1

vThe torch tip'bo'dy, as shown in Figure l i, 10

passages itwhich are accurately spacedfwith respect to one another; andare of uniform diameter. The passages 15 surround the central 0 withoutj tion.

' may subsequently be used to complete the iorma passage lfi and arepreferably spaced equidi's-; tantapart around-the central passage it.The number ofpassagesf i5 may be varied, as desired,

In the presentapplication, have shown the grooves originally produced inthe wall of the bore of the blank las being formedby the wire of.grooves in'the walloi' said bore by placing the 25:

blank on a'. longitudinallyribbed mandrel, such as disclosed in myco-pendin'g application, heredeparting from the scope oiv theinvenelements seated against the mandrel ,4. It is to inbeforementioned,- after which wire elementsf tion of thelongitudinalpassagesI5 and ll,- shown in-Figure l4, and as-herein disclosed.

I claimlas my invention:

1. A process of forming a in, which consistsdn placing the blank on a;

- :torch. trom' a single blank otductile metal having a boretheremandrel, the diameter of which is smaller than v the bore in theblank whereby an annular gap is wire elements becomeembedded in the wallof said bore,{rem'oving theblank from said mandrel and fplacing it onarelativelysmaller mandrel,- and from the blank, whereby a plurality oflongitudinally extending passages 5 and I8 are proe.

the ends of the tip body. 'These'hair lines, indi-" cate themetal-to-metal contact of :the metal of the blank forced around thewireelements bythe swaging operations. The swaging opera-' tions sothoroughly compact or force the metal of the blank around the wireelements, that the joints between the passages or orifices l5 and. I6

are substantially herme ically sealed, whereby body; as clearlyillusagain swaging thev blank until the wire" elements become completelyembedded in "the metal of the blank, and finally removing thewireelements and gases conducted through the passages in the torch tipbody cannot leak from one passage to another.

In the process, elements used to form thepassagesfi through the torchtip body, have'beenreduced-in diameter for each step, whereby thepassages or fgrooves,f as they actually are, in the first two or threeoperations, will gradually. be reduced inrsize, unt l the blank isswaged on the smaller mane drel i4. When the blank is swaged, whilesupported on the mandrel l4, the bore of the blank is reduced to thediameter of the mandrel l4,

whereby the wire elements l3v maybecome subr as above described, thewiremandrel frornfthe blank, whereby'a plurality of longitudinally extendingpassages are provided in theblank. '2; A -process of forming a torchtipifrom a single'pieceof ductile metal in the form oi a tubular blank,which consists ,in placing the blank on a mandrel,'the-diameterofwhich'is v65 smaller thanthe bore of the blank whereby an annular gapis provided betweenthe wall of said provided between the wall of saidbore and the periphery of the mandrel, placinga plurality or bore andthe periphery of the mandrel, placing a,

plurality offwire elements in said gap and supporting them in spacedrelation around the man'- drel, then swaging the-blank toreducegthe borethereof,- whereby the wire elements become partially embedded in thewall of said, bore, removing the blank, from said mandrel and placing iton 'agrel'atively' smaller mandreband repeating the swaging'operation,using'a smallenmandrel" of theblankand; the bore in the blank is reduced,[ior each-=swaging operation, until the wire ele-- ments becomecompletely embedded the metal to provide a central passage inthe torchtip,

' when the blank is removed from the mandrel,

and finally removing-the wire elements from the blank, whereby aplurality of longitudinally ex-, tending passages are provided in theblank which surround said central passage.

3. A proc ess oi forming -a.ztorch' tip drom any the blank and theperiphery otthe mandrel, placing a plurality of wire elementsdnsaid gapin spaced relation, then swaging the blank to reduce its diameter andbore, whereby the wire elements become partially embedded in the wall ofsaid bore, removing the blank from said'mandrel and the wire elementsfrom the blank,'then placing the blank on a relatively smaller mandreland inserting smaller wires in the grooves formed in the bore of theblank by the wires used in the first swaging operation, and againswaging the blank to further reduce its bore to the diameter oi thesecond mandrel, whereby the wire elements become further embedded in themetal of the blank, and finally replacing the wire elements and blank ofthe second-operation by a plurality of smaller wires and a relativelysmaller mandrel, the diameter of which corresponds to the centralpassage to be provided in the torch tip, when completed, and againswaging the blank until its bore is reduced to the diameter of the lastused mandrel, and whereby the wire ele- 1 ments become completelyembedded in the metal of the blank and iinally removing the mandrel andwire elements from the blank, whereby a plurality of longitudinallyextending passages are provided through the tip body, the repeated'swaging operations sealing the joints between said passages to preventleakage therebetween.

4. A process of forming a torch tip from a single blank of ductile metalhaving a bore therein, the wall of which has previously beenlongitudinally grooved, which consists in placing the grooved blank on amandrel and inserting a wire element through each groove, then swagingthe blank to reduce its bore to substantially the diameter of themandrel, removing the blank from said mandrel and placing it on arelatively smaller mandrel, and again swaging the blank until the wireelements become completely embedded in the metal of the blank, andfinally removing the wire elements and mandrel from the ELMER H. sm'rnlas

